This is something I've been thinking a bit about in the last few months.

TL;DR I don't think an LLM can create a language from scratch better than what we have. To LLMs they operate on a hoffoman coded format. (Generalization). For them, you probably could communicate directly in the token representation and you'd be better off. The actual language understanding for the LLM is probably very inefficent.

For human languages, I think there is opportunity here where you can build up intelligence on common reusable patterns and find places to optimize the usage, or break them down in a more cpu/readable way.